Use this procedure to remove standards that are not in use.
If necessary, open the Layer Properties Manager by clicking Home tabLayers panelLayer Properties.
Click .
Select the layer standards that you want to purge, and click Purge.
Click OK.
Note: To purge all layer standards and layer key styles in a drawing, enter AECPURGELAYERSTYLES. This is beneficial to use when creating custom templates or when importing new layer standards and layer key styles.